Fonts

In order to ensure that the IPA displays correctly -- especially the combining marks (diacritics) -- you will want to be sure to load at least one IPA-compatible web font. The Moodle IPA filter ships with two fonts that you can call, or you can use a carefully selected Google Web Font. In each case you will need to add a link to a particular style sheet in the HEAD area of Site administration > Appearance > Additional HTML.

Gentium

Gentium is the first font listed in the filter's 'font-family' so if you load it, it should display. Gentium is a slightly fanciful serif font that is very readable even at smaller sizes -- important when you are using unusual glyphs.